Breakdown of Sie legt das Buch in das Regal.
sie
she
das Buch
the book
in
in
legen
to lay / to put (flat)
das Regal
the shelf
Questions & Answers about Sie legt das Buch in das Regal.
Why do we say in das Regal (accusative) instead of in dem Regal (dative)?
in is a two-way preposition. Because she is actively moving the book onto the shelf (answering the question "where to?" or Wohin?), we must use the accusative case (das Regal). If the book were already resting on the shelf (answering "where at?"), we would use the dative case (in dem Regal).
Can I combine in and das into a shorter word?
Yes! In everyday German, it is very common to combine in and das into ins. Saying Sie legt das Buch ins Regal means exactly the same thing and sounds very natural.
Why does the sentence use legt instead of a general word for "putting"?
German doesn't have a single direct translation for "put." Instead, you use specific verbs depending on how you place the object. legen is used when you lay something down flat (horizontally). If she were placing the book upright (vertically) on the shelf, you would use stellen (so the verb would be stellt).
Is das Buch also in the accusative case?
Yes. The book is the direct object (the thing being placed), so it takes the accusative case. Since Buch is a neuter noun, its accusative article is das, which happens to look exactly the same as its basic "subject" form (nominative).
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